C# Discussion Boards - CodeProject

Christian Graus11-Jul-04 11:45

11-Jul-04 11:45

Well, it sounds to me like you have a bunch of small lines and you want to add their lengths, am I right ? That sounds fairly straighforward to me, or have I missed something ? If you store the co-ordinates in an arraylist, you can make that a data source for a data grid.

Christian

I have drunk the cool-aid and found it wan and bitter. - Chris Maunder

Re: Image Measurements

Rais Hafidz11-Jul-04 14:12

Rais Hafidz

11-Jul-04 14:12

Hi Christian
Thanks for the answer but since I am rather new with this C# programming I would relly much appreciate it if you could assist me on the programming codes. I honestly have no idea how to do this.

M

Re: Image Measurements

Christian Graus11-Jul-04 14:15

Christian Graus

11-Jul-04 14:15

at the top:
using System.Collections

in your class:
ArrayList points = new ArrayList();

when someone does a click

points.Add(ptMousePos ( however you get the point in the event ));

Then you can go through the array, and work out your lengths from each point pair, and create a form with a datagrid, and just have something like

theGrid.DataSource = points;
theGrid.DataBind();

Christian

I have drunk the cool-aid and found it wan and bitter. - Chris Maunder

Re: Image Measurements

Rais Hafidz11-Jul-04 15:09

Rais Hafidz

11-Jul-04 15:09

I really appreicate you fast reply. It sounded so easy for you. Like counting 1,2,3. Won't be easy for me since I'm a first time user. Anyway, thanks for the reply. I appreciate it very- very- very much. I'll try and give it a go.

M

Re: Image Measurements

Rais Hafidz12-Jul-04 15:37

Rais Hafidz

12-Jul-04 15:37

Dear Christian
I am really- really sorry to be bothering you again but I ave tried to program the codes but am unable to get anywhere near what I wanted (due to the fact that I'm a first time user). Do you have a running application so as I can study the code rather then having to develop the code. Thank you again and I honestly am really- really sorry for bothering you.
I apologize again.

M

Re: Image Measurements

Christian Graus12-Jul-04 15:41

Christian Graus

12-Jul-04 15:41

No need to apolgise, that's what this forum is for. Why don't you post some code, so I can have a look at it. What's it doing, and what do you want it to do differently ?

Christian

I have drunk the cool-aid and found it wan and bitter. - Chris Maunder

Re: Image Measurements

Rais Hafidz12-Jul-04 16:55

Rais Hafidz

12-Jul-04 16:55

Hi Chritian
I'll be very honest with you. I am a control and Electrical person who has no prior ecperience in high level language. NONE what so ever. Currently, what I'm doing is trying (really hard) to undertand people's programming codes (that's how I study this language) in addition to study the basic concept of C#. Since I am really- really new,I am unable to develop any codes cause it's hard enough for me to understnd the coding itself he!he!. Now I only manage to open and save file. I am still finding a way (whihc I doubt) to program the application stated before. Anyway, Christian I appreciate your fast responses an d you ever find codes that;s relevant to my rewuirements, please email them to me okay. Thank you again.

M

Creating a Preferences/Settings dialog.

Marlun11-Jul-04 8:02

Marlun

11-Jul-04 8:02

Hello

I want to make a preferences/settings dialog where you can click on a node in a treeview and then the controls to the right where you can change the settings change. How do I make this? Do I have alot of panal controls, fill them with what I want and then make one visible and the rest invisible or are there a better way?

Tips and ideas are very appreciated!

Thanks in advance!

~~~~~~~~~~~~~~
Martin Lundberg
Student, Sweden

I have to thank every member of the Code Project for making it such a great place for a beginner to learn!

Re: Creating a Preferences/Settings dialog.

Roman Rodov11-Jul-04 20:31

Roman Rodov

11-Jul-04 20:31

Implement every settings page as a separate UserControl.
When clicking on a tree node destroy the control currently visible and create
a new one corresponding to your entry.
You might want to consider having a settings class that will subscribe to events inside the controls on your UserControls to store the values of your preferences. However if the amount of settings groups/subgroups is not that great, I would recommend using the traditional tabbed dialog design instead.

gdi+ problem

kendao11-Jul-04 6:42

kendao

11-Jul-04 6:42

i draw some rectangle into my form and when i minize the rectangles disappeared how to slove this problem ?

Re: gdi+ problem

Name Removed11-Jul-04 10:53

Name Removed

11-Jul-04 10:53

Are you using the OnPaint event, and drawing it every time the form repaints?

Re: gdi+ problem

Jay Shankar11-Jul-04 18:57

Jay Shankar

11-Jul-04 18:57

1.Overide OnPaint Event and write all the painting algorithm inside this.
2. Use graphics object obtained from PaintEventArgs's Graphics property. This will ensure non-flickering during painting.

protected override void OnPaint ( System.Windows.Forms.PaintEventArgs e )
{		
   Graphics g = e.Graphics;
   //write your painting algorithm here...



}

Do revert back whether it could solve your problem or not?

Regards,

Jay.

C# WinSock Control

Axonn Echysttas11-Jul-04 6:31

Axonn Echysttas

11-Jul-04 6:31

Hi everybody. Smile | :)

I got a WinSock related question. This is mainly about C#. I find C# to be very strage in this problem... maybe because I'm a begginer in C#. I'm using the GetData method to retrieve some data a socket received. Here is the data about this method:

Void axWinsock.GetData (ref object data, object type, object maxLen)

In Visual Basic .Net the last two parameters are optional. But in C# you MUST provide them, otherwise the function will not work. I tried this... (in Socket_DataArrival)

object oRData;
oRData = "";
Socket.GetData(ref oRData, (object) null, (object) null);

After casting nulls to objects it worked, but I`m not sure if this is how I can avoid using those parameters. I`m not sure if the function will work.

But the big question is... HOW DO I GET THAT DATA OUT OF my object variable, oRData. Pfff... Smile | :)

I tried casting it to a string but that doesn't work. In fact,

object oRData;
oRData = "";
IRC.GetData(ref oRData, (object) null, (object) null);
MessageBox.Show ("Test");

When using a breakpoint... the GetData method gets executed, but surprise surprise... the Message Box is never displayed. It's just like the GetData method crashes the entire DataArrival event.

I`m totally puzzled Confused | :confused:

... anybody know anything?

Thank you in advance, have a nice day/night Wink | ;)

The Greater Mind Balance

windows folder properties

Hugo Hallman11-Jul-04 2:39

Hugo Hallman

11-Jul-04 2:39

How do I open up a windows shell folder properties dialog from dotNet?
I would prefer doing it purelly managed, but if required there's no real reason not to use interop (as I suppose I'd have to)

config file in console app to store connection string help

mtbjr11-Jul-04 1:17

mtbjr

11-Jul-04 1:17

My console project is named UsingConfigSettings in C#, and wanted to store the database connection in an application config file. I added an application config named "UsingConfigSettings.exe.config" in my project. Here is its contents:

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<appSettings>
<add key="constring" value="server=localhost;database=Northwind;uid=sa;pwd=;"/>
</appSettings>
</configuration>

I even copied it in the bin\debug folder in my C# console application, but it still doesn't work. I acccess it in the console as:

using System;
using System.Data;
using System.Data.SqlClient;
using System.Configuration;

public class UsingConfigSettings
{
public static void Main()
{
SqlConnection con = new SqlConnection(ConfigurationSettings.AppSettings["constring"]);

SqlCommand cmd = new SqlCommand();
cmd.CommandText = "SELECT * FROM Customers";
cmd.Connection = con;

con.Open();
SqlDataReader reader = cmd.ExecuteReader();

while(reader.Read())
{
Console.WriteLine("{0} - {1}", reader.GetString(0), reader.GetString(1));
}

con.Close();

Console.ReadLine();
}

}

but it won't work, it always issued a message of:

"An unhandled exception of type 'System.InvalidOperationException' occurred in system.data.dll

Additional information: The ConnectionString property has not been initialized."

If I don't use any config file, and replace the code above, it works fine:

SqlConnection con = new SqlConnection("server=localhost;database=Northwind;uid=sa;pwd=;");

Please help.

Query for data between dates

Anonymous11-Jul-04 0:24

Anonymous

11-Jul-04 0:24

Hi all,
How can we query xml data between two dates by using XPath.
For example:
I have an XML file like this
"<Employees>
<Employee>
<Name>xxxx</Name>
<DateOfJoin>'2000-04-12T10:12:30'</DateOfJoin>
</Employee>
<Employee>
<Name>yyyy</Name>
<DateOfJoin>'2001-04-12T10:12:30'</DateOfJoin>
</Employee>
<Employee>
<Name>zzzz</Name>
<DateOfJoin>'2002-04-12T10:12:30'</DateOfJoin>
</Employee>
<Employee>
<Name>aaaa</Name>
<DateOfJoin>'2003-04-12T10:12:30'</DateOfJoin>
</Employee>
<Employee>
<Name>bbbb</Name>
<DateOfJoin>'2004-04-12T10:12:30'</DateOfJoin>
</Employee>
</Employees>"

Now I want employee names between 2002 and 2003.
Thanks inadvance. Rose | [Rose]

Re: Query for data between dates

Dave Kreskowiak11-Jul-04 7:17

Dave Kreskowiak

11-Jul-04 7:17

Your question would be better answered in the XML/XSL Forum. Not the C# Forum...

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

MSIL vs JAVA Bytecode vs Intel Assmebly Language

Hashim Saleem11-Jul-04 0:20

Hashim Saleem

11-Jul-04 0:20

Well, I am searching for amlost 3 hours on internet for any article that shows comparison between "MSIL", "JAVA Bytecode" and "Intel Assembly Language", but couldnt even fine ONE

Anyone here to help me?

TIA

Re: MSIL vs JAVA Bytecode vs Intel Assmebly Language

Steven Campbell11-Jul-04 5:26

Steven Campbell

11-Jul-04 5:26

Thats strange, I typed "il bytecode comparison" in google and got several thousand results.

my blog

Re: MSIL vs JAVA Bytecode vs Intel Assmebly Language

leppie11-Jul-04 5:28

leppie

11-Jul-04 5:28

Look at some open source software!

GAS - GNU assembler (supports AT&T and Intel style)
HLA - High level assembly

MSIL - Portable .NET , Mono

JAVA - many opensource stuff, look the IKVM.NET too (included with mono), also the GNU Class path stuff.

What your are asking is a for something like compare all the apples in 3 countries..... You just have to do it your self. MSIL vs JAVA byte code shouldnt be to difficult, however native CPU assembly is different from platform to platform , even huge differences on the same platform.

^{top secret xacc-ide 0.0.1}

Re: MSIL vs JAVA Bytecode vs Intel Assmebly Language

Dave Kreskowiak11-Jul-04 7:16

Dave Kreskowiak

11-Jul-04 7:16

My questions would be: What do you want to compare? What's the point of the comparison?

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

read address of I/o

ahmed mohamed abdelhameed10-Jul-04 16:03

ahmed mohamed abdelhameed

10-Jul-04 16:03

How to read the address of LPT (parallel port) and the COM port (RS232) by the code in C#

Textbox input.

Nick Z.10-Jul-04 13:48

Nick Z.

10-Jul-04 13:48

Im thinking of a way to input text into a textbox of another application. Supposing that I have the handle to that textbox.

Right now the only way of doing something like that, that I can think of, involves breaking up the needed string input into characters. Then posting a WM_KEYDOWN message or something for each character to the textbox. I'm not even sure if thats possible. Anybody has an idea?

I tried to find something that would allow me to change the text property of the textbox or WM_SOMEMESSAGE that would allow me to do what I want, as well as various API functions etc., but I had no luck. Can anybody point me in the right (some) direction. I'm running out of ideas. The method I mentioned above seems unnecesarily complicated, but I might be forced to do it that way. Well I'm gonna go look for some api functions again. I hope someone has an idea.

Thank you.

Re: Textbox input.

Nick Parker10-Jul-04 18:52

Nick Parker

10-Jul-04 18:52

If you have the handle to the textbox you want to set the text of, you can simply P/Invoke SendMessage and pass the handle with the corresponding WM_SETTEXT message.

[DllImport("user32.dll")]
static extern IntPtr SendMessage(IntPtr hWnd, uint Msg, IntPtr wParam, IntPtr lParam);
int WM_SETTEXT = 0x000C;
string text = "Hello";
SendMessage(YourHandle, WM_SETTEXT, null, text);

- Nick Parker
My Blog | My Articles

Re: Textbox input.

Nick Z.10-Jul-04 19:09

Nick Z.

10-Jul-04 19:09

I sent EM_SETSEL and then EM_REPLACESEL, but SETTEXT seems easier. Plus one less overload of SendMessage() to have. I have about 4 sending different messages with different parameter types.

Thanks.

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